IEEE - The Institute of Electrical and Electronics Engineers@ Inc.
Latest
IEEE 588-1976
Scope
General Format. This application guide for the relay protection of squirrel-cage and wound-rotor induction motors and synchronous motors presents a review of the generally accepted forms of motor protection and summarizes the use of relays and devices@ singly and in combination@ so the reader may select the necessary equipment to obtain adequate motor protection. The gi de is concerned primarily with the protection of three-phase integral horsepower motors and refers to two- phase motors only in special instances where specifically indicated. This guide is not a standard and does not purport to detail the protective requirements of all motors in every situation. Its recommendations are of a general nature@ designed to cover the usual or typical motor installations. Sufficient background material on objectives@ applications@ and setting philosophy is presented@ however@ to enable the reader to evaluate the need for various forms of protection and to select and properly apply suitable equipment for most situations. Section 2@ Motor Protection Requirements@ presents a brief description of the damaging effect on a motor of abnormal voltage@ current@ temperature@ and incorrect operating conditions or procedures. A clear understanding of the electrical and mechanical response of the motor to these abnormalities will greatly assist the reader in evaluating the need for@ and the means of@ obtaining adequate motor protection in any specific situation. Section 4@ Settings and Adjustments of Protective Devices@ presents a discussion of the various factors that must be considered in determining the setting of each relay or device. Whenever it is applicable@ a discussion is given on the desireability of using a device to ac?tuate an alarm or a trip.